accrue vs amass

accrue

verb
  • To accumulate. 

  • To become an enforceable and permanent right. 

  • To increase, to rise 

  • To reach or come to by way of increase; to arise or spring up because of growth or result, especially as the produce of money lent. 

  • To be incurred as a result of the passage of time. 

amass

verb
  • to gather a great quantity of; to accumulate. 

  • To accumulate; to assemble. 

  • To collect into a mass or heap. 

How often have the words accrue and amass occurred in a corpus of books? (source: Google Ngram Viewer )